They will give you more amp hours of reserve and seem to take abuse much better. Plus going to AGM will let them charge quicker, discharge slower (so you let them sit longer in storage before you recharge them), should last longer than normal lead acid, maintenance free but cost more money.
The unwritten rule is two 6 volts are equivalent to three 12 volts but if you have the original OEM batteries IMO its more like 2 = 4 since the factory ones are usually 60 to 80 amp hours each and dont recover like a 6 v. These are 220 amp hour each (but 6 volts so when hooked in series = 12 volt but still @ 220 amp hour – not 440).
Many treads on this subject.... try some searches and make your conclusions.
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